Powerful magnets hold any fastener securely Great for use in impact or non-impact applications Set includes an extension and universal joint Made of high quality steel (chrome-molybdenum); thorough and exact heat treatment insures the correct balance of strength and durability Lifetime warranty This magnetic impact socket set features our high torque drive. This feature limits the amount of wear on the corners of the fastener and the socket. It also improves the strength of the socket, transfers increased torque to the fastener and allows easier access to tight areas. Each socket is thoroughly made with the correct balance of strength and durability and is tested to the highest specifications to deliver outstanding performance at the most competitive cost. Set contains the following sizes: 3/16", 7/32", 1/4", 9/32", 5/16", 11/32", 3/8", 7/16", 1/2" in standard length; metric sizes: 5mm, 5.5mm, 6mm, 7mm, 8mm, 9mm, 10mm, 11mm, 12mm, 13mm, 14mm, 15mm in standard length; also includes 2" extension and a 1/4" x 1/4" Universal Joint. Packaged in a molded storage case.